Charles Cavalcante

Common Child: https://www.hackerrank.com/challenges/special-palindrome-again/problem String Manipulation: https://www.hackerrank.com/challenges/common-child/problem

Next challenge: Merge Sort: Counting Inversions: https://www.hackerrank.com/challenges/ctci-merge-sort/problem Sorting: https://www.hackerrank.com/interview/interview-preparation-kit/sorting/challenges

Maximum Xor: https://www.hackerrank.com/challenges/maximum-xor/problem Miscellaneous: https://www.hackerrank.com/interview/interview-preparation-kit/miscellaneous/challenges

Friend Circle Queries: https://www.hackerrank.com/challenges/friend-circle-queries/problem Miscellaneous: https://www.hackerrank.com/interview/interview-preparation-kit/miscellaneous/challenges

Time Complexity: Primality: https://www.hackerrank.com/challenges/ctci-big-o/problem Miscellaneous: https://www.hackerrank.com/interview/interview-preparation-kit/miscellaneous/challenges

Recursive Digit Sum: https://www.hackerrank.com/challenges/recursive-digit-sum/problem Recursion and Backtracking: https://www.hackerrank.com/interview/interview-preparation-kit/recursion-backtracking/challenges

Crossword Puzzle: https://www.hackerrank.com/challenges/crossword-puzzle/problem Recursion and Backtracking: https://www.hackerrank.com/interview/interview-preparation-kit/recursion-backtracking/challenges

Recursion: Davis' Staircase: https://www.hackerrank.com/challenges/ctci-recursive-staircase/problem Recursion and Backtracking: https://www.hackerrank.com/interview/interview-preparation-kit/recursion-backtracking/challenges

Balanced Forest: https://www.hackerrank.com/challenges/balanced-forest/problem Trees: https://www.hackerrank.com/interview/interview-preparation-kit/trees/challenges

Tree: Huffman Decoding: https://www.hackerrank.com/challenges/tree-huffman-decoding/problem Trees: https://www.hackerrank.com/interview/interview-preparation-kit/trees/challenges